Help running csgo

Hi guys i have recently played csgo legit on a friends computer because mine is broken.

i need your help in finding a computer for a few things

1.to run csgo
2.run teamspeak

those are the main things i would be using also general use of internet.

my question is could anyone help me by giving me a link from ebay or amazon that could help me find a pc tower for my needs

my budget is £100-£300
Tower only i have a tv as monitor.

thanks for all help in advance appreciate it :)